Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi, my name is***** will be assisting you.
The belt that you are putting on the machine. Is it an original equipment belt? Or an aftermarket belt? Is this the mule drive belt that comes from the engine up to the deck or the cross drive belt that actually runs between the blade spindles? Do all the pulleys look like they are aligned fairly close? What condition is the idler spring in? Can you provide a full model and serial number from the machine so that I can better assist you?
Yes, the mule drive belt runs from the back of the engine up to the mower deck.
Can you tell me the part number that you have been putting on that keeps jumping off?
Can you measure across the two idler pulleys on the rear that the belt goes through and tell me what size they are? I wonder if someone has replaced them at some time and put the wrong size on.
It won't have any tension if the belt is off. You have the correct belt on the machine. The spring could be stretched some that would cause the belt to not stay as tight as it should which would let if come off of the pulleys.
Your pulleys should be good, according to the parts manual you have a 5" and a 6" there. Do you notice the belt coming off when you first engage the deck or does it come off after you have been mowing for a while?
I am going to recommend that you replace the spring, I think that it may be stretched a bit which is allowing your belt to come off under certain conditions. Have you noticed if it makes a difference as to the deck height?
Yes, the Exmark part number is *****
Thank you it has been a pleasure to assist you.
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